Separable spark-plug.



A. RQ MQSLER. SBPARABLE SPARK PLUG.

APPLIQATION FILED Nov. 19.71908.

1,131,154. Patented Mar.9,1915.

7%57@ @JJ e5 In Ve n ZU@ IUNITED STATES PATENT OFFICE.

ARTHUR R. MOSLER, OF NEW YORK, N. Y., ASSIGNOR TO A. R. MOSLEB, & CO., OF NEW YORK, N. Y., A. CORPORATIQN 0F NEW YORK. 'i

SEPARABLE simeri-PLUG.l

Specication of Letters Patent.

Patented Mar. 9, 1915.

Application filed November 19. 1908.' Serial 110.463,474.

T o all 'whom it may concern:

Be it known that ARTHUR R. MosLER, a citizen of the United Stat-es, and resident of the borough of Manhattan, in the city and State of blew York, have ini'ented a new and uset'ul Improvement in Separable Spark-Plugs, of which the following is a specification.

My invention relates to spark plugs and has for one of its objects to provide a spark plug in which the shell is composed of separable sections, so that the plug may be very readily taken apart for cleaning, without unscrewing the shell from the cylinder wall.

Another object is to provide a spark plug in whichv the insulating block is spaced from the lshell so as to insure a more perfect insulation.

A further object is to provide certain improvements-in the construction, form and arrangement of the several. parts whereby a more perfect ignition is obtained.

A practical embodiment of my invention is shown in the accompanying drawings in which,

Figure 1 is a side View of my spark plug screwed in position in a. portion of the cylinder wall, Fig. 2 is a longitudinal central section ot the same, Fig. 3 is a similar View of the inner portion of the shell, Fig. 4 is a similar View ot the remainder of the plug, Fig. 5 is a. side view of the inner section of the shell, Fig. t is an inner end view of the inner section ot the shell, Fig. 7 is an outer end view of the saine, and Fig. 8 is a deltail view, partlyy in section, showing the manner in which the sparking point is pinched in the conducting wire.

The shell of the spark plug` comprises the inner section 1, the outer section or cap 2 and the intermediate section Il. The inner section is prorid'ed with cleaning holes 4, 5, through its inner end and side Walls and its outer end is reduced` leaving the shoulder G. 'lhis reduced portion is cxteriorly screw threaded for engagement with the interim-ly screw-threaded inner end of the intermediate sei-tion il. 'l"lie inner section is hollow and is provided with an enlarged chamber ti* near its outer end. '.l`hc outer end of the intermediate section Il is exteriorly screwthreaded for engagement with the interiorly screw-threaded outer section 2. The intermediate section 3 is further provided with an interior annular flange 7 intermedi- 55 ate its ends.

The insulating block comprises the reduced end portions 8,9, and the enlarged intermediate portion 10. This block is provided with a hole therethrough and the reduced end portion 8 has an enlarged recess 11 therein, at the bottom of which there is an angular recess 12. The inner end of the insulating block is spaced av distance from the holes 4, 5, thus forming a combustion chamber within the plug for insuring the ignition of the main charge and the cleaning?r of the sparking point.

The conducting wire 13 passes through the insulating block and is screw-threaded lt is provided` .l

for a portion of its length. with a nut 14 thereon which fits the angular recess i2, so as to permit the conducting wire to lie longitudinally adjusted by t'urn-v fe: The outer end 75 of the conducting wire pi'oiects beyond the infr it in either direction.

insulating block, and may be provided with the usual lock mit 15 and thumb nut 16. The inner end of the conducting wire is provided with a hole for the reception of the 30 sparking .point 17. which point is secured in position by pinchinfr the end of the conducting wire around said sparking point, as shown at 1S. A small space is left between the inner end of the sparking point and the liottom of the hole in the conducting wire for permitting' the sparking point to expand as it is pinched. The pinching pressure is exerted at a point intermediate the ends of the sparking point, so that the inner e'nd 90 shoulder G on the inner section 1 of the shell 95 and the inner end ot the intermediate SeC- tion 3. A packing ring 2O is disposed between the outer end of the section 1, the reduced end portion 8 of the insulating,ir block and the flange 7 on the intermediate section. 100

A packing ring 21 is disposed between the flange 7 and the enlarged intermediate portion 10 of the insulating block. Apacking ring Q2 is disposed between the outer end ot the section 3, the enlarged portion 10 and 105.

.the outer section 2. All these packing,r rings serre to make. the, spark plug gastight and the rings 20, 21, 2Q., also serve to space the insulating block from the shell so as to insure a perfect insulation. The packing rings 21, 22, also serve to hold the insulating block within the outer and intermediate sections 2, 3, when they are separated from the innervse'ction l.

The provision of the chamber 6* near the outer end of the inner portion of the shell is a very valuable feature, inasmuch as it absolutely prevents short circuitin ofthe plug due to the collection of oil an soot between the insulating block and the shell. its operation is as follows: Every time oompression takes place inthe cylinder in connection with which the plug is being used, the chamber 6*'is filled with explosive vapor, and when explosion takes place, the combustion in thechamber 6* efeotually clears the space between the insulating block and the inner portion l of the shell, of any oil or soot.

By the construction hereinabove set forth, I obtain a separable spark plug the interior parts of 'which may be very easily takenout for cleaning, without removing the inner section of the shell from the cylinder wall, thus entirely exposing the inner part of the insulating block and conducting wire While the same are still firmly held by the intermediate and outer sections of the shell. This is a very valuable feature in practice. Further-more, the plug 4is absolutely proof against short circuiting resulting from the collection of oil vor soot.

It is to be understood that. Ido not wish to-limit mysel't` strictly to the form and construction herein set forth as many alterations may be made without departing from the spirit and scope of my invention.

What I claim is:

A spark plug comprising a shell composed of inner, outer `and intermediate sections, said inner section having holes through its inner ends and side walls, said intermediate section having an interior annular flange intermediate its ends, a conducting wire and insulating block having reduced end portions and an enlarged intermediate portion, packing rings interposed between the enlarged intermediateportion of the block, the flange and the outer section of the shell, for holding the' insulating' block independently of the inner section, and another packing ring interposed between the said flange and the outer end of the inner vsection of the shell.

In testimony, that I claim the foregoing as m ,invention I have si ed m name 5 in presenceof two witnesses, this twenty- Second day of October 1908.

ARTHUR R. MOSLER.

-VVitnessesz F. 'GEORGE BARRY, C. S. SUNDGREN. 

